Vehicle ID help please

[Bill Murray]

This vehicle has been posted on another forum where we play "what is this tune" and is stated to be a Royal Navy anti-aircraft gun mounted on a British lorry chassis.

The Gun has been identified as a 47mm AA unit and the poster has said that is correct.

I cannot for the life of me find a British lorry that looks like this one in all of my stuff. The front wheels look very distinctly German as do the rear wheels and tyres but I cannot get a match in my German reference stuff. The vehicle also looks like it may be RHD due to the absence of mirrors etc. on the left side but I can not go any further with an ID

Any ideas?
Bill